Comparing hash values computed at function entry and exit for increased security

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12164921
APP PUB NO 20220191020A1
SERIAL NO

17123711

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Abstract

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In response to encountering a function entry instruction while running an application, a processor computes an entry hash value using a hash of three hash input parameters, wherein one of the input parameters is a secret key stored in the special purpose register. In response to encountering a function exit instruction, the processor computes an exit hash value using the same three input parameters and the same hash used when computing the entry hash value. The processor determines if the entry hash value is the same as the exit hash value. In response to the entry hash value being the same as the exit hash value the processor exits the function and in response to the entry hash value not being the same as the exit hash value the processor executes a trap interrupt.

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Patent Owner(s)

Patent OwnerAddress
INTERNATIONAL BUSINESS MACHINES CORPORATIONNEW ORCHARD ROAD ARMONK NY 10504

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chatterjee, Debapriya Austin, US 27 34
Ekanadham, Kattamuri Mohegan Lake, US 56 1118
Flores, Arnold Round Rock, US 15 150
Moreira, Jose E Irvington, US 72 789

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